Know all about Pseudotachylite and Gritstone properties here. All properties of rocks are important as they define the type of rock and its application. Pseudotachylite belongs to Metamorphic Rocks while Gritstone belongs to Sedimentary Rocks.Texture of Pseudotachylite is Quench whereas that of Gritstone is Earthy. Pseudotachylite appears Dull and Soft and Gritstone appears Layered and Foliated. The luster of Pseudotachylite is vitreous while that of Gritstone is dull. Pseudotachylite is available in black, brown, colourless, green, grey, pink, white colors whereas Gritstone is available in beige, black, brown, colourless, cream, dark brown, green, grey, light green, light to dark grey, pink, red, white, yellow colors. The commercial uses of Pseudotachylite are creating artwork, gemstone and that of Gritstone are an oil and gas reservoir, as a feed additive for livestock, gemstone, metallurgical flux, production of lime, soil conditioner, source of magnesia (mgo), tombstones.